Etymology

neptunium

N1E1P3T1U1N1I1U1M3

Today it means: The transuranic chemical element with atomic number 93 and symbol Np. Full definition →

English Neptune ← Middle English Neptune ← Old English Neptune
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The story

  1. Proto-Indo-European*nebʰ-
  2. Proto-Indo-European*népōts
  3. Etruscan𐌍𐌄𐌐𐌄𐌕𐌄 (nepete)
  4. Proto-Italic*neptūnos
  5. LatinNeptūnus
  6. Old EnglishNeptune
  7. Middle EnglishNeptune
  8. EnglishNeptune
  9. English todayneptunium

After Neptune (the planet), + -ium. The previous element is uranium, named after the previous planet: Uranus.

Etymology from Wiktionary, CC BY-SA 4.0.